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s^2 = r^2 + t^2
s^2 = 5^2 + 12^2
s^2 = 25 + 144
s^2 = 169
s = 13 cm
A. Luas selimut = ?
L = 3,14 x r x s
L = 3,14 x 5 x 12
L = 204,1 cm^2
B. Luas permukaan = luas selimut + luas alas
L.p = 204,1 + (3,14 x 5 x 5)
L.p = 204,1 + 78,5
L.p = 282,6 cm^2
r=5cm
t =12cm
dit:
a)luas slimut?
b)luas prmukaan?
jwb:
*s²=r²+t²
s²=5²+12²
s²=25+144
s²=√169
s=13cm
a)l selimut=Πrs
3,14.5.13
204,1cm²
b)l prmkan=Πr²
3,14.5.5
78,5cm²