JSS 1 Mathematics Flashcards: Measuring and Identifying Types of Angles

Question 1

Which instrument is used to measure an angle?

Accepted Answer

protractor

Question 2

Where should the protractor’s centre be placed when measuring an angle?

Accepted Answer

on the angle’s vertex

Question 3

One arm of an angle should align with which part of a protractor?

Accepted Answer

the zero baseline

Question 4

What is an acute angle?

Accepted Answer

an angle greater than 0° but less than 90°

Question 5

What is an obtuse angle?

Accepted Answer

an angle greater than 90° but less than 180°

Question 6

Two adjacent angles share what features?

Accepted Answer

a common vertex and a common arm

Question 7

When two straight lines cross, vertically opposite angles are ____.

Accepted Answer

equal

Question 8

One of two vertically opposite angles is $68^\circ$. What is the other?

Accepted Answer

$68^\circ$

Question 9

Angles on a straight line add up to ____.

Accepted Answer

$180^\circ$

Question 10

One angle on a straight line is $127^\circ$. Find the adjacent angle.

Accepted Answer

$53^\circ$

Question 11

Angles around a point add up to ____.

Accepted Answer

$360^\circ$

Question 12

Angles around a point are $90^\circ,110^\circ,75^\circ$ and $x$. Find $x$.

Accepted Answer

$85^\circ$

Question 13

When a transversal crosses parallel lines, corresponding angles are ____.

Accepted Answer

equal

Question 14

When a transversal crosses parallel lines, alternate interior angles are ____.

Accepted Answer

equal

Question 15

If a corresponding angle is $72^\circ$, what is its matching angle on the other parallel line?

Accepted Answer

$72^\circ$

Question 16

Which real-life object commonly shows an acute angle?

Accepted Answer

slightly opened scissors

Question 17

Which angle type is formed at the corner of a rectangular book?

Accepted Answer

right angle

Question 18

Two angles sum to $90^\circ$. If one is $37^\circ$, find the other.

Accepted Answer

$53^\circ$

Question 19

Which pair is NOT necessarily equal when parallel lines are cut by a transversal: corresponding, alternate interior, vertically opposite, or adjacent angles?

Accepted Answer

adjacent angles

Question 20

Why must the correct protractor scale be read?

Accepted Answer

The scale beginning at the aligned zero arm gives the angle measure.

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