Question

find perimeter of triangle

Answer 1

Perimeter of the Given figure = (perimeter of rectangle) + (perimeter of triangle) - (length of the common side)


=> [2(5p + 2p)] + [3p + 5p +7p] - 5p

=> 14p + 10p = 57
=> 24p =57
=> p = 57/24

NOW, Perimeter of triangle = 7p + 5p + 3p
=> 15p
=> 15 x 57/24
=> 35.625

Answer 2

P = 1/2 x Base x Height

P = 1/2 x 3 x 5

P = 15/2

P = 7.5 (cm)