Angles inside polygons take center stage. Fourth graders find the missing angle in a triangle with 40° and 70°, the fourth corner of a quadrilateral with 85°, 95°, and 110°, and the base angles of an isosceles triangle whose top is 40°. A clock-hand problem at 4:00 stretches estimation skills.
Fill-in items lock down core facts — quadrilateral angles total 360°, an equilateral triangle has three 60° angles, a square has four 90° corners — then apply them to mixed problems like a right triangle with a 50° angle. Students leave able to break any polygon into sums they can solve.
Style:
Angles and Measurement
Part A: Multiple Choice
Circle the best answer for each question.
1. A triangle has angles of 40° and 70°. What is the third angle?
A) 60°
B) 70°
C) 80°
D) 90°
2. A quadrilateral has angles of 85°, 95°, and 110°. What is the fourth angle?
A) 60°
B) 70°
C) 80°
D) 90°
3. The hands of a clock at 4:00 form what angle?
A) 90°
B) 100°
C) 110°
D) 120°
4. An isosceles triangle has a top angle of 40°. What does each base angle measure?
A) 60°
B) 70°
C) 80°
D) 140°
Part B: Fill in the Blank
Write the correct answer on each line.
1. The sum of all angles in any quadrilateral is 360 degrees.
2. A triangle with angles 60°, 60°, and 60° is called an equilateral triangle.
3. If a triangle has a right angle and a 50° angle, the third angle is 40 degrees.
4. A square has four angles that each measure 90 degrees.
5. The hands of a clock at 12:30 form an angle of about 165 degrees.
Angles and Measurement
★ Part A: Multiple Choice
Circle the best answer for each question.
1. A triangle has angles of 40° and 70°. What is the third angle?
A) 60°
B) 70°
C) 80°
D) 90°
2. A quadrilateral has angles of 85°, 95°, and 110°. What is the fourth angle?
A) 60°
B) 70°
C) 80°
D) 90°
3. The hands of a clock at 4:00 form what angle?
A) 90°
B) 100°
C) 110°
D) 120°
4. An isosceles triangle has a top angle of 40°. What does each base angle measure?
A) 60°
B) 70°
C) 80°
D) 140°
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) The sum of all angles in any quadrilateral is 360 degrees.
2) A triangle with angles 60°, 60°, and 60° is called an equilateral triangle.
3) If a triangle has a right angle and a 50° angle, the third angle is 40 degrees.
4) A square has four angles that each measure 90 degrees.
5) The hands of a clock at 12:30 form an angle of about 165 degrees.
Ready to Practice?
Complete each section carefully.
9 Questions
12-18 minutes
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