Question

Calculate the perimeter of the triangle in the figure.

A. 23 cm
B. 33 cm
C. 20 cm
D. 3cm

Answer 1

Hint: Perimeter is the sum of length of the boundaries of any polygon. Perimeter is calculated to find out the length of
the surface of any polygon.
Formula used: Perimeter (P)= sum of all sides of the given polygon.

Complete step-by-step answer:
Perimeter of triangle = sum of three sides
$P = a + b + c$
In the given triangle
a = 10 cm,
b = 8 cm
c = 5cm
Perimeter = $a + b + c$
$
= 10 + 8 + 5 \\
= 18 + 5 \\
23cm \\
$
Thus, the perimeter of ABC with sides 10cm, 8 cm and 5 cm is 23 cm.
Hence, the correct option is A.

Note: When calculating the perimeter, no matter which is the polygon given, just add up the length of all the sides which will in turn give us the perimeter of the figure.