Basic Angle Properties Flashcards

All 6 cards in this deck

What do angles at a point add up to?

$360^\circ$

What do angles at a point on a straight line add up to?

$180^\circ$

What is true about vertically opposite angles?

They are equal.

e.g. two lines crossing with one angle $50^\circ$ give $50^\circ$ opposite it.

What do the angles in a triangle add up to?

$180^\circ$

What is the exterior angle of a triangle equal to?

The sum of the two opposite interior angles.

e.g. interior angles $40^\circ$ and $70^\circ$ give an exterior angle of $110^\circ$.

In an isosceles triangle, what do you know about the angles?

The two base angles (opposite the two equal sides) are equal.