High School Placement Test (HSPT) Practice Test

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Prepare for the High School Placement Test. Utilize resources with multiple-choice questions, detailed solutions, and expert tips. Ace your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

In a triangle where two angles measure 15° and 85°, what is the measure of the third angle?

75°
80°
90°
70°

The correct answer is: 80°

To determine the measure of the third angle in a triangle, you can use the fundamental property that the sum of the angles in any triangle is always equal to 180 degrees. In this case, you are given two angles measuring 15° and 85°. First, add the two given angles together: 15° + 85° = 100°. Next, to find the third angle, subtract this sum from 180°: 180° - 100° = 80°. Therefore, the measure of the third angle is 80°. This approach ensures that you correctly account for the total angle measure in a triangle, reinforcing your understanding of geometric principles.