Question

The measure of two sides of a triangle are respectively 18cm and 10cm. The

semi perimeter is 21cm. The measure of the third side is _____.

(a) 7cm (b) 14cm (c) 21 cm (d) 28cm​

Answer 1

Answer:

I think the answer is (a) 7cm

Answer 2

Step-by-step explanation:

semi perimeter = sum of three sides/2

Given semi perimeter=21cm

(18+10+third side)/2=21

28+third side =21x2

third side =42-28=14

Therefore Third side= 14cm

option (b)