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 May 7th, 2017, 02:10 AM #1 Newbie   Joined: May 2017 From: Pakistan Posts: 7 Thanks: 0 Solve the Triangles Solve below step by step 1) In ∆ABC, if A+B+C = 180°, show that tanA + tanB + tanC = tanA . tanB . tanC 2) An arc subtends an angle of 70° at the center of a circle and its length is 132 mm. Find the radius of the circle. 3) Find radius of circle when the sides of triangles are all equal. 4) How far a boy on bicycle travel in 5 revolution if the diameter of the wheels of his bicycle each equal to 50cm? 5) A belt 24.75meter long passes around a 1.5cm diameter pulley. As the belt make two complete revolution in a minute, how many radians does the wheel turn in one second? Last edited by skipjack; May 7th, 2017 at 09:34 AM.
 May 7th, 2017, 03:07 AM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 Do you just want someone to do your homework for you? How about trying to do these yourself and posting your attempts. That way we will have an idea what you do understand about these and what hints will help you. Thanks from skeeter
 May 7th, 2017, 09:32 AM #3 Global Moderator   Joined: Dec 2006 Posts: 20,941 Thanks: 2210 (1) Proved here. (3) The question doesn't explain how the triangles are related to the circle.

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### A belt 24.75 meter long passes over a 1.5 cm diameter pulley. As the belt makes four complete revolution in a minute how many radians does the flywheel turn in one second

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