Angles in a triangle

Difficulty Stretch · Set vjdrf7

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
Two angles of a triangle are 23° and 28°. What is the third, in degrees?
2
Two angles of a triangle are 52° and 43°. What is the third, in degrees?
3
Two angles of a triangle are 29° and 34°. What is the third, in degrees?
4
Two angles of a triangle are 25° and 29°. What is the third, in degrees?
5
Two angles of a triangle are 33° and 24°. What is the third, in degrees?
6
Two angles of a triangle are 39° and 57°. What is the third, in degrees?
7
Two angles of a triangle are 41° and 22°. What is the third, in degrees?
8
Two angles of a triangle are 24° and 58°. What is the third, in degrees?
9
Two angles of a triangle are 36° and 35°. What is the third, in degrees?
10
Two angles of a triangle are 24° and 63°. What is the third, in degrees?
11
Two angles of a triangle are 48° and 35°. What is the third, in degrees?
12
Two angles of a triangle are 45° and 43°. What is the third, in degrees?
13
Two angles of a triangle are 47° and 35°. What is the third, in degrees?
14
Two angles of a triangle are 27° and 26°. What is the third, in degrees?
15
Two angles of a triangle are 41° and 41°. What is the third, in degrees?
16
Two angles of a triangle are 31° and 31°. What is the third, in degrees?
17
Two angles of a triangle are 45° and 40°. What is the third, in degrees?
18
Two angles of a triangle are 36° and 47°. What is the third, in degrees?
19
Two angles of a triangle are 21° and 66°. What is the third, in degrees?
20
Two angles of a triangle are 51° and 20°. What is the third, in degrees?

What is in this set

The numbers in this set run from 20 to 68.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the angles of a triangle add to 180°, not 360°.
Answers are a whole number.

Drawing 240 problems from this page produced 225 different ones, 94% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.