Answer :
A = 1/2bh
20 = 1/2b(5)
20 = 2 1/2b
20 × 2/5 = 2/5 × 5/2b
8 = b
P = 4a
P = 4(13)
P = 52cm²
20 = 1/2b(5)
20 = 2 1/2b
20 × 2/5 = 2/5 × 5/2b
8 = b
P = 4a
P = 4(13)
P = 52cm²