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Triangle angle sum worksheet generator

Missing-angle problems in triangles, plus classification by angle type.

Triangle Angle Sum

Name: Date:

1.
Two angles measure 99° and 35°. Find the third.
2.
Two angles measure 59° and 95°. Find the third.
3.
Two angles measure 61° and 51°. Find the third.
4.
Two angles measure 25° and 116°. Find the third.
5.
Two angles measure 100° and 62°. Find the third.
6.
Two angles measure 57° and 108°. Find the third.
7.
Two angles measure 92° and 77°. Find the third.
8.
Two angles measure 70° and 40°. Find the third.
9.
Two angles measure 58° and 48°. Find the third.
10.
Two angles measure 82° and 79°. Find the third.
11.
Two angles measure 72° and 81°. Find the third.
12.
Two angles measure 83° and 64°. Find the third.
13.
Two angles measure 56° and 26°. Find the third.
14.
Two angles measure 46° and 41°. Find the third.
15.
Two angles measure 80° and 27°. Find the third.
16.
Two angles measure 42° and 27°. Find the third.
17.
Two angles measure 70° and 95°. Find the third.
18.
Two angles measure 48° and 41°. Find the third.
19.
Two angles measure 20° and 109°. Find the third.
20.
Two angles measure 85° and 23°. Find the third.

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Triangle Angle Sum — Answer Key

Name: Date:

1.
Two angles measure 99° and 35°. Find the third.
46°
2.
Two angles measure 59° and 95°. Find the third.
26°
3.
Two angles measure 61° and 51°. Find the third.
68°
4.
Two angles measure 25° and 116°. Find the third.
39°
5.
Two angles measure 100° and 62°. Find the third.
18°
6.
Two angles measure 57° and 108°. Find the third.
15°
7.
Two angles measure 92° and 77°. Find the third.
11°
8.
Two angles measure 70° and 40°. Find the third.
70°
9.
Two angles measure 58° and 48°. Find the third.
74°
10.
Two angles measure 82° and 79°. Find the third.
19°
11.
Two angles measure 72° and 81°. Find the third.
27°
12.
Two angles measure 83° and 64°. Find the third.
33°
13.
Two angles measure 56° and 26°. Find the third.
98°
14.
Two angles measure 46° and 41°. Find the third.
93°
15.
Two angles measure 80° and 27°. Find the third.
73°
16.
Two angles measure 42° and 27°. Find the third.
111°
17.
Two angles measure 70° and 95°. Find the third.
15°
18.
Two angles measure 48° and 41°. Find the third.
91°
19.
Two angles measure 20° and 109°. Find the third.
51°
20.
Two angles measure 85° and 23°. Find the third.
72°

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Frequently asked questions

How do I print or save these worksheets as a PDF?: Click Print worksheet and choose your printer, or pick “Save as PDF” as the destination to keep a digital copy. The answer key prints on its own page.
Can I get a fresh set of problems?: Yes. Click New problems for a brand new randomly generated worksheet, as many times as you like.
Is this worksheet generator free?: Yes. Every generator on the site is free to use, with no account, no watermark and unlimited printing for classroom or home use.