Answer:
84
Step-by-step explanation:
This is because of the formula for perimeter of a triangle is P= Side A+ Side B + Side C. If I just input these and do the math I get an answer
84m
From the above diagram;we get
Perimeter of triangle=Sum of all sides
=21m+28m+35m
=84m
So the perimeter of the triangle is 84m
