Page 161 - Math Smart - 7

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Types of angles Sheet
Supplementary angles
are two angles that add
Adjacent angles have a . ^ ft QO '
n
BO 90 JOo
up to 180°.
common vertex and one
common side.

Vertically opposite angles
Complementary angles A protractor is an instrument have a common vertex and
are two angles that add used to measure angles. their sides are formed by
up to 90°. The angles are measured in the same lines.
degrees {°) .

An acute angle A right angle is An obtuse angle A straight line is A reflex angle
A revolution
measures between equal to 90°. measures between equal to 180°. measures between
is equal to 360'
O'and 90°. 90° and 180°. 180° and 350°.

Angle properties

360'
The sum of angles on a The sum of the interior
straight line is 180°. angles of a triangle is 180'
^o+^b=180° ^0+ Z.b + ^c= 180°
(zis on a str. line) {L sum of A)

The sum of angles at a
point is 360°.
^0+ zlb+ zlc = 360°
(zs at a point)

The sum of the interior
Vertically opposite angles of a quadrilateral
angles are equal. is 360°.
^0 = i-b ^a + ^b + ^c+ ^cl= 360°
(vert. opp. L%) (sum of As in a quad.)