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t = √13² - 5²
t = √169 - 25
t = √144
t = 12
ditanya : luas segitiga?
jawab : L = 1/2 x a x t
L = 1/2 x 10 x 12
L = 60cm
3. ditanya : keliling lingkaran?
jawab : K = 2 x π x r
K = 2 x 22/7 x 3,5
K = 2 x 22 x 0,5
K = 22cm
semoga membantu :)