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Recap: Special Triangles

Part of the Triangles section of Coddy's Geometry journey. Lesson 50 of 71.

Challenge

A 45-45-90 triangle has legs of 7.

$A right isosceles triangle with both legs 7 and hypotenuse c, the two acute angles marked 45 degrees$

Find its hypotenuse c in simplified form.

Try it yourself

c = sqrt(7^2 + 7^2)

Solve for c

All lessons in Triangles

2The Triangle Inequality

Can Three Sticks Meet?Exactly Reaching How Short Can It Be?How Long Can It Be?The Range of the Third Side The Formula Whole-Number Sides Recap: The Third Side

5The Hypotenuse

Squares on the Sides Finding the Hypotenuse Pythagorean Triples When It Is Not Whole Simplifying the Root Recap: The Hypotenuse

8Special Right Triangles

The 45-45-90 Triangle Legs from the Hypotenuse The 30-60-90 Triangle All Three Sides Which Triangle Is It?Recap: Special Triangles

11Mixing Area and Pythagoras

Height of an Isosceles Area from the Height The Equilateral Triangle Right Triangle Perimeter Recap: Two Tools