Angles in a quadrilateral

Difficulty Stretch · Set 9dd5ai

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1
Three angles of a quadrilateral are 85°, 47°, 67°. What is the fourth, in degrees?
2
Three angles of a quadrilateral are 50°, 44°, 101°. What is the fourth, in degrees?
3
Three angles of a quadrilateral are 40°, 77°, 35°. What is the fourth, in degrees?
4
Three angles of a quadrilateral are 51°, 50°, 51°. What is the fourth, in degrees?
5
Three angles of a quadrilateral are 72°, 50°, 41°. What is the fourth, in degrees?
6
Three angles of a quadrilateral are 43°, 46°, 62°. What is the fourth, in degrees?
7
Three angles of a quadrilateral are 24°, 87°, 62°. What is the fourth, in degrees?
8
Three angles of a quadrilateral are 37°, 74°, 40°. What is the fourth, in degrees?
9
Three angles of a quadrilateral are 40°, 65°, 100°. What is the fourth, in degrees?
10
Three angles of a quadrilateral are 49°, 94°, 75°. What is the fourth, in degrees?
11
Three angles of a quadrilateral are 23°, 48°, 63°. What is the fourth, in degrees?
12
Three angles of a quadrilateral are 70°, 25°, 106°. What is the fourth, in degrees?
13
Three angles of a quadrilateral are 32°, 88°, 109°. What is the fourth, in degrees?
14
Three angles of a quadrilateral are 55°, 36°, 21°. What is the fourth, in degrees?
15
Three angles of a quadrilateral are 44°, 95°, 34°. What is the fourth, in degrees?
16
Three angles of a quadrilateral are 54°, 25°, 87°. What is the fourth, in degrees?
17
Three angles of a quadrilateral are 22°, 99°, 54°. What is the fourth, in degrees?
18
Three angles of a quadrilateral are 26°, 100°, 44°. What is the fourth, in degrees?
19
Three angles of a quadrilateral are 29°, 76°, 33°. What is the fourth, in degrees?
20
Three angles of a quadrilateral are 71°, 37°, 79°. What is the fourth, in degrees?

What is in this set

The numbers in this set run from 20 to 138.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 53% of the problems: the angles of a quadrilateral add to 360°, not 180°.
Answers are a whole number.

Drawing 240 problems from this page produced 239 different ones, 100% — 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.