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Home > Maths I > Measure and Shape > Angles involved with circles

Maths I

Angles involved with circles

Important facts about circles (continue)

More important facts to remember

Isoceles triangle. Wide base, angle obtuse at the top. Top angle is labelled b degrees, and the two bottom angles are labelled a degrees and c degrees. At the bottom is an equation that says a degrees plus b degrees plus c degrees equals 180 degrees.

The three angles in a triangle add up to 180°.

If we have a right-angled triangle we can use Pythagoras' Theorem - The square of the hypotenuse is equal to the sum of the squares on the other two sides. Or \;{a^2 = b^2 + c^2} where a is the hypotenuse.

A right angled triangle. The hypotenuse is line a, the vertical is line b, and the bottom is line c. At the top is an equation saying a squared equals b squared plus c squared

Watch

Detail of a circular school.

Class Clips

Video news clip about the advantages for a school in Wales being built with all circular classrooms

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A picture of Mia Cadaver

Tombstone Timeout

Swot up your sums with Mia Cadaver's maths game

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