The figure shows a trapezium PQRS whose lengths are in centimetres. If area of PQRS is 72 cm2, find the value of x.
A 2
B 4
C 6
D 8
Ans 1:
Class : Class 8
Area of trapezium = 1/2 * h * (a+b)
72 = 1/2 * 6 * (4x+3x+10)
72 = 1/2 * 6 * (7x+10)
72 = 3 * (7x+10)
72 = 21x + 30
21x = 42
x = 42/21
x = 2
Thus, answer is A