Angle Measures and Relationships

The video tutorial reviews module four for grade four, focusing on calculating unknown angles without a protractor. It covers finding the measure of angle A by subtracting a known angle from 360 degrees, determining angle ABD using a straight line subtraction from 180 degrees, and calculating angle DBC by using line properties and subtraction. The tutorial emphasizes understanding geometric principles and arithmetic operations to solve angle problems.

What is the total degree measure of a circle?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

If a smaller angle measures 75 degrees, what is the measure of the remaining angle in a full circle?

• 285 degrees

• 275 degrees

• 295 degrees

• 265 degrees

What is the first step in calculating the measure of angle A?

• Subtract 75 degrees from 360 degrees

• Add 75 degrees to 360 degrees

• Divide 360 degrees by 75 degrees

• Multiply 75 degrees by 2

How can you verify if angle A is greater than 90 degrees?

• By ensuring it's more than 90 degrees

• By comparing it to 360 degrees

• By checking if it's less than 180 degrees

• By subtracting it from 90 degrees

What is the degree measure of a straight line?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

How do you find the measure of angle ABD?

• Add 55 degrees to 180 degrees

• Subtract 55 degrees from 180 degrees

• Multiply 55 degrees by 2

• Divide 180 degrees by 55 degrees

What is the measure of angle ABD?

• 125 degrees

• 135 degrees

• 115 degrees

• 145 degrees

In problem C, what is the first step to find the unknown angle?

• Add 80 and 50 degrees

• Subtract 80 from 180 degrees

• Multiply 80 by 50

• Divide 180 by 80

What is the sum of angles 80 and 50 degrees?

• 120 degrees

• 130 degrees

• 140 degrees

• 150 degrees

What is the measure of the angle after subtracting 130 degrees from 180 degrees?

• 70 degrees

• 60 degrees

• 40 degrees

• 50 degrees