Question

Find the perimeter of this semi-circle with diameter, d= 54cm.
Give your answer as an expression in terms of π.

Answer 1

Answer:

$27\pi$

Step-by-step explanation:

Since the diameter is 54 cm, and the formula for the circumference(perimeter) of a circle is $2\pi r$ or $\pi d$, we can multiply 54 by pi to get the circumference of the entire circle. This is $54\pi$

Now, since we are finding the circumference of the semicircle, we just divide this by 2 to get $27\pi$.

Hope this helped!

Answer 2

Step-by-step explanation:

$solution \\ diameter = 54cm \\ radius = 54 \div 2 = 27cm \\ now \\ perimeter \: of \: semi \: circle = πr + 2r, \\ = 22 \div 7 \times 27 + 2 \times 27 \\ = 84.85 + 54 \\ =138.85cm$

we can write 27π also