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Recap: Two Tools

Part of the Triangles section of Coddy's Geometry journey. Lesson 66 of 71.

Challenge

An isosceles triangle has equal sides 17 and base 16. Its height is the root of 17^2 - 8^2.

$An isosceles triangle with equal sides 17, base 16 and a dashed height h splitting the base into halves of 8$

Find its area A.

Try it yourself

A = 1/2 * 16 * sqrt(17^2 - 8^2)

Solve for A

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 PerimeterRecap: Two Tools