Lesson One · Part 4
Activities, Drills and Learning Games
Four self-marking activities. Each one targets a different skill from the lesson: recognising types, computing complements and supplements, estimating measures, and answering exam-style questions.
Game 1 — Classify the Angle
A random angle is drawn. Name its type before the next one appears. Score one point for each correct answer.
Game 2 — Complement & Supplement Speed Drill
Sixty seconds. Type the complement (90° − angle) or the supplement (180° − angle) as requested. Press Enter to submit.
Game 3 — Protractor Challenge
Drag the slider until the drawn angle matches the target measure. Within 3° is excellent, within 8° is a pass.
Build an angle of
65°
Activity 4 — Exam-Style Quiz
Twelve multiple-choice questions taken from the lesson exercise. You get instant feedback and a short reason for each answer.
1.m(∠A) + m(reflex ∠A) equals the measure of …
2.If m(∠X) = 120°, then m(reflex ∠X) = …
3.The complement of an acute angle is always …
4.What is the type of the angle that supplements a zero angle?
5.Two complementary angles are in the ratio 2 : 3. The greater angle is …
6.Two angles measure 143° and 37°. They are …
7.Adjacent angles must share …
8.If the outer sides of two adjacent angles are perpendicular, the angles are …
9.If the outer sides of two adjacent angles lie on one straight line, the angles are …
10.1° equals …
11.An angle measuring 89° 60′ is a(n) …
12.BD bisects ∠ABC and m(∠ABC) = 76°. Then m(∠ABD) = …
Activity 5 — Classroom Tasks (offline)
Angle hunt
Photograph five angles around the school (door, ladder, clock hands, ramp, scissors). Estimate each measure, then check it with a protractor and classify it.
Billiards & squash
On a billiard table, ∠1 = ∠3 = 43° and the three angles lie on a straight line. Find ∠2 (answer: 94°). Repeat with your own bounce angles.
Gate arm model
A gate arm stands 42° from the vertical. Through what angle must it turn to become horizontal? Build a cardboard model and verify (answer: 48°).