diameter lingkaran 84 cm luasnya adalah.......cm2

L = phi x r x r = 22/7 x 42 x 42 = 5544

π ×[tex] r^{2} [/tex]

[tex] \frac{22}{7} [/tex] x 42 x 42

[tex] \frac{38808}{7} [/tex] = 5544 cm2