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Unknown angles in a triangle Name: _________________________________ Date: _______________________ The internal angles of any triangle add up to 180˚. The triangles are not drawn to scale so you will not be able to measure the angles! This is an equilateral triangle – all three sides are the same and all three angles are the same. Therefore each internal angle is ___________ degrees. a An isosceles triangle has two equal sides and two equal angles. If angle a = 42˚ then the other two angles in the triangle will each be ______________ degrees. Calculate the missing internal angles in these triangles: 68° 50° 72° 20° 131° 28° I can find the missing angles with a triangle © www.teachitprimary.co.uk 2015 I can do this! 25296 I’m getting there. I need help! Page 1 of 1