Page 59 - Cambridge Checkpoint Mathematics Coursebook 7_Slide 02
P. 59
5.2 Drawing and measuring angles
2 Draw angles of the following sizes.
a 62° b 157° c 200° d 295° e 19° f 111° g 342° h 233°
3 a Measure the angles labelled x°, y° and z°.
When we use small italic letters to
label angles, each letter stands for
a number of degrees.
x°
z°
y°
b Explain why the angles should add up to 360°. Use this fact to check your accuracy.
4 a Measure the angles labelled r°, s° and t°.
b The angles should add up to 900°. Use this fact to check your accuracy.
s°
r°
t°
c If the triangle was equilateral, what would be the values of r, s and t? Give a reason
for your answer.
5 The angles of a triangle are 125°, 37° and 18°.
a What are the refl ex angles at the corners of this triangle?
b Can you draw a triangle where one of the angles of the triangle is a refl ex angle?
5 Angles 57
