Question

The diagram shows a shape made from an equilateral triangle with a semicircle. The diameter of the semicircle is 8cm. Find the perimeter and area of this shape.​

Answer 1

24.568 cm

Explanation:

`(c)/(2) = (1 )/(2)\pi \: \:d`

Length is 8cm, so the circumference is...

• C/2 = 1/2πd
• (Since 22/7 as π will get an unending decimal and may get inaccurate, use π = 3.142)
• = 1/2 × 3.142 × 8
• = 12.568cm.

Perimeter is...

• 12.568 + 12
• = 24.568