Using the Hero’s formula
S = ½ (a + b + c) (semi-perimeter of the triangle)
S =1/2 (12 + 16 +8)
S = 18 m^2
joseph rimiru answered the question on October 3, 2017 at 17:07
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Calculate the height of a cone if its base radius is 7.7 cm and has a volume of 514.6 cm^3.
(Solved)
Calculate the height of a cone if its base radius is 7.7 cm and has a volume of 514.6 cm^3.
Date posted:
October 2, 2017
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Answers (1)
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A metal tube whose bore is 100 mm and thickness 21 is 7 m long. Find the volume of the metal it is made from.
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A metal tube whose bore is 100 mm and thickness 21 is 7 m long. Find the volume of the metal it is made from.
Date posted:
October 2, 2017
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Answers (1)
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Given that Cos x = sin (5x + 10). Find a. x b. ...
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Given that Cos x = sin (5x + 10). Find a. x b. Tan x
Date posted:
October 2, 2017
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Answers (1)
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Find the volume of a prism 30 cm long and its cross-section is regular, pentagon of side 10 cm.
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Find the volume of a prism 30 cm long and its cross-section is regular, pentagon of side 10 cm.
Date posted:
October 2, 2017
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Answers (1)
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Given that the density of lead is 11.4 g/cm^3. Calculate the mass of a lead sphere whose radius is 15 cm.
(Solved)
Given that the density of lead is 11.4 g/cm^3. Calculate the mass of a lead sphere whose radius is 15 cm.
Date posted:
October 2, 2017
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Answers (1)
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A water tank is placed is placed on a concrete tower which is a regular hexagon of 5 m sides and height of 35 m....
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A water tank is placed is placed on a concrete tower which is a regular hexagon of 5 m sides and height of 35 m. Find the volume of the concrete used to make it.
Date posted:
October 1, 2017
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Answers (1)
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(Solved)
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Date posted:
October 1, 2017
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Answers (1)
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A regular hexagonal nut of sides 6 cm and height 4 cm was used in lorry. Find its volume, assume it is a solid.
(Solved)
A regular hexagonal nut of sides 6 cm and height 4 cm was used in lorry. Find its volume, assume it is a solid.
Date posted:
October 1, 2017
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Answers (1)
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A sphere whose diameter is 28 cm. find the surface area of the sphere.
(Solved)
A sphere whose diameter is 28 cm. find the surface area of the sphere.
Date posted:
September 30, 2017
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Answers (1)
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Find the value of sin 60° , Cos 60° and Tan 60° without using the mathematical tables.
(Solved)
Find the value of sin 60⁰ , Cos 60⁰ and Tan 60⁰ without using the mathematical tables.
Date posted:
September 30, 2017
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Answers (1)
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State the value of the trigonometric ratios leave your answer in surds form a. sin 45° b. Cos 45° c. Tan 45°
(Solved)
State the value of the trigonometric ratios leave your answer in surds form
a. sin 45°
b. Cos 45°
c. Tan 45°
Date posted:
September 30, 2017
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Answers (1)
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If the radii of two spheres are 7 cm and 21 cm and the volume of the bigger sphere is 729 cm^3 . Find the...
(Solved)
If the radii of two spheres are 7 cm and 21 cm and the volume of the bigger sphere is 729 cm^3 . Find the volume of the smaller sphere.
Date posted:
September 30, 2017
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Answers (1)
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A rectangle whose area is 36 cm^2 is given an enlargement with linear scale factor of 2....
(Solved)
A rectangle whose area is 36 cm^2 is given an enlargement with linear scale factor of 2. Find the area of the image obtained.
Date posted:
September 30, 2017
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Answers (1)
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ABCD is a square with A(2,2) and C(5,3) . Find the equation of the diagonal BD
(Solved)
ABCD is a square with A(2,2) and C(5,3). Find the equation of the diagonal BD
Date posted:
September 30, 2017
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Answers (1)
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Find the equation of the line from the point (-1, 4/3) and perpendicular to the line whose equation is ; y-3x+1=0
(Solved)
Find the equation of the line from the point (-1, 4/3) and perpendicular to the line whose equation is; y-3x+1=0
Date posted:
September 30, 2017
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Answers (1)
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The width of a rectangle is a third of the length. If the perimeter is 96 cm. Find the width
(Solved)
The width of a rectangle is a third of the length. If the perimeter is 96 cm. Find the width
Date posted:
September 30, 2017
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Answers (1)
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Given that x=5/12;find the value of (a).COS X (b).SIN X (c).COS(90-X) (d).SIN(180-X)
(Solved)
Given that x=5/12;find the value of (a).COS X (b).SIN X (c).COS(90-X) (d).SIN(180-X)
Date posted:
September 30, 2017
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Answers (1)
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Find the area of a triangle whose included angle is 30° and the sides being 5 cm and 9 cm.
(Solved)
Find the area of a triangle whose included angle is 30⁰ and the sides being 5 cm and 9 cm.
Date posted:
September 29, 2017
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Answers (1)
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On a map with a scale of 1:500 000, a coffee plantation covers an area of 20 cm^2 . Find the actual area of the...
(Solved)
On a map with a scale of 1:500 000, a coffee plantation covers an area of 20 cm^2 . Find the actual area of the plantation I hectares.
Date posted:
September 29, 2017
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Answers (1)
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The area of a sector of a circle radius 35 cm is 490 cm^2. Calculate the angle subtended at the centre of the circle. (Take...
(Solved)
The area of a sector of a circle radius 35 cm is 490 cm^2. Calculate the angle subtended at the centre of the circle. (Take π =22/7 ).
Date posted:
September 29, 2017
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Answers (1)