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b. l= 34²- (7-23)²
r = 7
R = 23 cm
1. d² = p²-(r+R)²
d² = 34² - 30²
d² = 1156 - 900
d = √256 = 16 cm
2. l² = p²-(R-r)²
l² = 34² - 16²
l² = 1156 - 256
l = √900 = 30 cm