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The length of the base of a triangle is (3x + 5) cm and its height is 10 cm. If the area of the triangle is 115 cm² , what is the value of x?

Class: KCPE

Subject: Mathematics

Topic: Length,perimeter and area

Lesson Summary

The length of the base of a triangle is (3x + 5) cm and its height is 10 cm. If the area of the triangle is 115 cm² , what is the value of x?

A.7
B.6
C.8
D.5



Text Answer


Area of triangle =12 base × height

12(3x + 5) x 10 = 115

3x + 5 =115×210= 23

3x = 23 – 5 = 18

X =183=6

The correct answer is B (6)

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