nomor 11 dan 13 tolong bantuan nya

11.

l² = p² - (r1 - r2)²
12² = p² - (7,5 - 2,5)²
p² = 12² + 5²
[tex]p = \sqrt{144 + 25} [/tex]
[tex]p = \sqrt{169} [/tex]
p = 13cm (B.)

13.

l² = p² - (r1 - r2)²
2,4² = 2,5² - (1,5 - r2)²
(1,5 - r2)² = 2,5² - 2,4²
[tex](1.5 - r2) = \sqrt{0.49} [/tex]
(1.5 - r2) = 0.7
r2 = 1.5 - 0.7
r2 = 0.8 cm
d2 = r2 × 2
d2 = 0.8 × 2 = 1.6 cm (C.)

Semoga Membantu :-)