Page 145 - Math Smart - 7
P. 145
Q Use your protractor to measure the angles inside the triangles that
make up the quadrilateral.
La = ^g =
/Lc = /-i =
Ad = ^/ =
'.
/Le = A/c =
^/ =
Q Sum of angles = Sum of angles =
Conclusion: The sum of the interior angles in a quadrilateral is
Calculate angle a.
The sum of the interior
angles in a quadrilateral
is 360°.
Solution
0+ 85° + 69° + 110° = 360° (sum of int. As in a quad) Remember to state the reason
= 360°-85°-69°-110° 'sum of As in a quad'.
= 360° - 264°
= 96°
Check My
Understanding
Calculate the size of the unknown angles.
