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1.386 = 22/7 x r²
r² = 1.386 x 7/22
= 441
r = √441
= 21
s² = t² + r²
= 28² + 21²
= 784 + 441
= 1.225
s = √1.225
= 35
L permukaan = ( x r² )+ ( x r x s)
= (22/7 x 21²) + (22/7 x 21 x 35)
= 1.386 + 2.310
= 3.696 cm²