Geometrical Reasoning Flashcards

Vertically opposite angles are ?

Vertically opposite angles are equal.

Angles on a straight line add up to ?

Angles on a straight line add up to 180°.

Angles at a point add up to ?

Angles at a point add up to 360°

Angles in a triangle add up to ?

Angles in a triangle add up to 180°

Base angles of an isosceles triangle are ?

Base angles of an isosceles triangle are equal.

Angles in an equilateral triangle are

Angles in an equilateral triangle are equal.

An exterior angle (of a triangle) is equal to the sum of the ? opposite angles

An exterior angle (of a triangle) is equal to the sum of the interior opposite angles.

Angles in a quadrilateral add up to ?

Angles in a quadrilateral add up to 360°

Exterior angles of a polygon add up to ?

Exterior angles of a polygon add up to 360°

The interior and exterior angles of any polygon add up to ?

The interior and exterior angles of any polygon add up to 180°

Alternate angles are ?

Alternate angles are equal.

Corresponding angles are ?

Corresponding angles are equal.

Co-interior angles add up to ?

Co-interior angles add up to 180°

The angle at the centre of a circle is ? the angle at the ?

The angle at the centre of a circle is twice the angle at the circumference

Angles in the same segment are ?

Angles in the same segment are equal

The angle in a semicircle is a ? (or 90 ̊)

The angle in a semicircle is a right angle (or 90 ̊)

Opposite angles in a cyclic quadrilateral add to ?

Opposite angles in a cyclic quadrilateral add to 180

Tangents to a circle from an external point are ?

Tangents to a circle from an external point are equal in length

A tangent to a circle is ? (or 90 ̊) to the radius.

A tangent to a circle is perpendicular (or 90 ̊) to the radius.