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((1/2 x a x t) 2) + (pxl) = (1/2 x 8 x 10)2 + (40x8) = 40x2 + 320 = 80+320 = 400 cm2
25) luas persegi panjang - luas setengah lingkaran = (pxl) - (1/2x22/7xrxr) = (28x21) - (1/2x22/7x10,5x10,5) = 588 - 173,25 = 414,75 cm2
26) luas lingkaran = 22/7 x r x r
2464 = 22/7 x r x r
2464 x 7 = 22 x r x r
17248 = 22 x r x r
784 = r x r
r = akar 784
r = 28