Pack B — Fluency

Mathematics

Year 7 · 7.8 Angles

Pack B · Fluency

Name: _________________________________

Date: _________________ Class: ___________

Answer all questions. Show your working. Questions are grouped by challenge level.

BronzeQuestions 1–10

1.
Two equal angles sit on a straight line. Find the size of each angle. Justify that they sum to 180°.
2.
Two angles on a straight line are 112° and an unknown angle. Calculate the unknown angle. Show the subtraction and verify the pair sums to 180°.
3.
Four angles meet at a point. Three of them are 100°, 75°, and 60°. Calculate the fourth angle and verify all four sum to 360°.
4.
A triangle has angles 90° and 35°. Calculate the third angle and verify all three sum to 180°.
5.
A quadrilateral has angles 110°, 70°, and 95°. Calculate the fourth angle and verify all four sum to 360°.
6.
Two lines cross and form four angles. One angle is 117°. Calculate all four angles and check they sum to 360°.
7.
An angle on a straight line measures 74°. Calculate its supplementary angle (the other angle on the straight line) and show they add to 180°.
8.
An isosceles triangle has two equal base angles. The angle at the top is 70°. Calculate each base angle, showing the subtraction and division. Check your answer.
9.
A pair of parallel lines is cut by a transversal. One co-interior angle is 73°. Calculate the other co-interior angle and verify both sum to 180°.
10.
A pair of parallel lines is cut by a transversal. One alternate angle is 131°. State and justify the alternate angle on the other side. Then calculate the co-interior angle on the same side.

SilverQuestions 11–20

11.
Find angle $x$ . Two angles on a straight line are $x$ and 48°.
12.
Three angles meet at a point on a straight line: 43°, 98°, and $x$ . Find $x$ .
13.
A triangle has angles $x$ , 72°, and 39°. Find $x$ .
14.
An isosceles triangle has a top angle of 70°. Find each base angle.
15.
A quadrilateral has three angles: 95°, 88°, 102°. Find the fourth angle $x$ .
16.
Find the exterior angle of a regular 9-sided polygon.
17.
Find the interior angle of a regular 8-sided polygon.
18.
Two parallel lines are cut by a transversal. A corresponding angle is 64°. Find the angle marked $x$ on the same side of the transversal, between the parallel lines (co-interior).
19.
Two lines cross. One angle is 113°. Find all four angles formed.
20.
An equilateral triangle has all sides equal. What is each interior angle?

GoldQuestions 21–30

21.
A triangle has angles $x$ , $2x$ , and 24°. Find $x$ and the largest angle.
22.
Two angles on a straight line are $(3x + 10)°$ and $(5x − 18)°$ . Find $x$ and each angle.
23.
Two angles on a straight line are in the ratio 1 : 5. Find each angle.
24.
A quadrilateral has angles $x$ , $x + 20°$ , $2x$ , and $x − 10°$ . Find $x$ and each angle.
25.
Two parallel lines are cut by a transversal. One alternate angle is $(4x − 12)°$ and the other is $(2x + 18)°$ . Find $x$ .
26.
A regular polygon has 10 sides. Find its interior angle and state the name of the polygon.
27.
A regular polygon has an exterior angle of 15°. How many sides does it have?
28.
A protractor reading shows an angle of 97.4°. A second angle is 49.4° smaller. Find the second angle and state its type.
29.
The exterior angle of a triangle is 134°. One of the non-adjacent interior angles is 67°. Find the other non-adjacent interior angle.
30.
An angle is $\frac{{num}}{{den}}$ of a full turn. Find the angle in degrees and state its type.

PlatinumQuestions 31–40

31.
Two parallel lines are cut by a transversal. A co-interior angle is $(5x + 8)°$ and the other co-interior angle is $(3x + 4)°$ . Find $x$ and both angles.
32.
A pie chart shows three sectors. The first sector represents 25% of the data and the second represents 45%. Find the angle of the third sector.
33.
A regular polygon has interior angles of 140°. How many sides does it have? Then find its exterior angle.
34.
In a triangle, angle A is twice angle B, and angle C is 15° more than angle A. Find all three angles.
35.
A triangle has angles in the ratio $1 : 3 : 5$ . Find each angle.
36.
A survey asks 200 people their favourite colour. 90 choose blue, 50 choose red, and the rest choose green. Find the pie chart angle for green.
37.
Use the formula (n − 2) × 180° to find the sum of interior angles of a 11-sided polygon. Then find each interior angle if it is regular.
38.
A triangle has angles 47.6°, 81.5°, and $x$ °. Find $x$ , giving your answer as a decimal.
39.
A kite has two pairs of equal angles. The angles are $x$ , $x$ , 130°, and 50°. Find $x$ .
40.
A bearing is measured clockwise from North. A ship sails on a bearing of 310°. How many degrees short of a full turn is this? Give the reflex angle formed on the other side of North.