Tentukan keliling dan luas bangun berikut …

A. k = 2.8 + 2.3
= 16+6
= 22 cm
l = 8×4
= 32 cm²
b. k = 15+9
= 24 cm
l = ½x15x9
= ½x135
= 67,5 cm²
c. k = 7+20+24+18
= 69 cm
l = ½x20x24
= ½x480
= 240 cm²