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154 = 22/7 x r^2
154 x 7 = 22 x r^2
1078 = 22 x r^2
1078/22 = r^2
49 = r^2
7 = r
s^2 = r^2 + t^2
s^2 = 7^2 + 24^2
s^2 = 49 + 576
s^2 = 625
s = 25 cm
Luas selimut = phi x r x s
= 22/7 x 7 x 25
= 22 x 25
= 550 cm
Jadi jari jari kerucut adalah 7 cm dan luas selimutnya 550 cm
Semoga membantu :)