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Type: Multiple-Choice
Category: Pythagorean Theorem and Applications
Level: Grade 10
Standards: HSG-SRT.C.8
Author: nsharp1
Created: 4 years ago

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Grade 10 Pythagorean Theorem and Applications CCSS: HSG-SRT.C.8

In the circle pictured,

$O$ is the center of the circle and

$bar{AD}$ is tangent to the circle. If

$AD = 5 \ "cm"$ and

$DO = 6.4 \ "cm"$ , what is the length of the diameter of the circle, rounded to one decimal place? Hint: A line tangent to a circle is perpendicular to the radius of the circle at that point.
Circle ABCD

2.4 cm
4.0 cm
8.0 cm
16.2 cm