Can a right angled triangle be isosceles?
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Yes. a 45–45–90 right triangle is an isosceles triangle. Two sides are equal in length and two angles are also equal. A 45–45–90 right triangle is a triangle that has angles of 45, 45 and 90 degrees. read more
_ (Yes, the three angles of an isosceles right triangle must be 90, 45 and 45. 5) The two sides adjacent to the right angle must be equal to each other in an isosceles triangle, so pick a length for both of these sides and label it, or use two lines to represent that they are of equal length. read more
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Further Research
Equilateral, Isosceles and Scalene
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Isosceles Right Triangle -- from Wolfram MathWorld
mathworld.wolfram.com
The isosceles right triangle. Topics in trigonometry
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