Question

The cross-section of the prism below is an equilateral triangle.

a) What is the area of the shaded face?
b) How many rectangular faces does the prism have?
c) What is the total area of these rectangular faces?
(shape is below in the attached picture)​

Answer 1

a) (9 cm)(7 cm) = 63 cm²

b) This prism has three rectangular faces.

c) 3(63 cm²) = 189 cm²