Page 25 - TB_5B

Activity 2 The Sum of the Angles in a Quadrilateral

Learn how to find the sum of the angles in a quadrilateral.

Method 1 Use a protractor. What you need: Protractor

ad e h il
bc f g jk

ABC
abcde f gh i j k l
Angle ( )

Sum of the
Interior Angles ( )

Method 2 Cut out the angles in a quadrilateral. ad

Mark the angles in a quadrilateral and then cut out
the angles.

Put the pieces together with their vertices all at b c

one point.

ba c cd

ba ba

Find the sum of the four angles. A quadrilateral can be
a + b + c + d 360Ø divided into two triangles

Therefore, the sum of the angles in a quadrilateral to find the sum of the
is 360Ø. angles in a quadrilateral.

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