The diagram shows a triangular prism of length 7cm. The r...
The diagram shows a triangular prism of length 7cm. The right-angled triangle PQR is a cross-section of the prism |PR| = 5cm and |RQ| = 3cm. What is the area of the cross-section?
4cm2
6cm2
15cm2
20cm2
Correct answer is B
In Δ RQP, QR2 + QP2 = RP2
32 + QP2 = 52
QP^2} = 5\(^2 - 32
QP = √16
= 4 cm
∴ Area = \frac{1}{2} \times base \times height
= \frac{1}{2} \times 3 \times 4
= 6 cm^2
Similar Questions
If x = 3 and y = -1, evaluate 2(x^2 - y^2)...
A binary operation ⊕ on real numbers is defined by x⊕y = xy + x + y for any two real numbers x a...
The roots of a quadratic equation are -1/4 and 3. The quadratic equation is...
Simplify \frac{324 - 4x^2}{2x + 18}...
If the volume of a cube is (8 x 103)cm^3, what is the surface area the cube?...
Evaluate the following limit: lim_{x\to2} \frac {x^2 + 4x - 12}{x^2 - 2x}...
If the distance between the points (x, 3) and (-x, 2) is 5. Find x ...