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In order to estimate a given angle, keep in mind a 90° angle (right angle).
A 90° angle looks like a corner of a rectangular piece of paper or a corner of a square.
Let's look at an example.
Consider the angle given below.
Let's estimate the measure of this angle.
Observe that, the size of this angle is less than 90°.
The size of this angle is
of the size of a right angle.
So, the estimate for the measure of the given angle is 45°.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.