Question

ABC is the middle line of MN in an equilateral triangle. If AB = 8 cm, then find the perimeter MBN.

A)18 cm B)24 cm C)16 cm D)20 cm E)12 cm​..

Answer 1

the answer is 12

Explanation:

since the triangle is equilateral meaning all side of ABC is equal to each other AB= BC = AC= 8cm and MN is the middle line that divides AB and BC by two

thus, MB =BN= 4 cm. MN is the middle line thus will also be equal to the half of AC meaning MN=AC/2= 4cm. and perimeter is MBN = MN+MB+BN= 4cm+4cm+4cm =12cm