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2 years ago

14

Quadrilateral ABCD is a rhombus. What conditions must be true?

1 answer:

belka [17]2 years ago

3 0

Answer: B, C, D

Step-by-step explanation:

A <u>rectangle</u> must have at least one right angle, not a rhombus. So, A is wrong.
This is a specific property of a rhombus, so B is correct.
This is a specific property of a rhombus, so C is correct.
Since all rhombi are parallelograms, and diagonals of a parallelogram bisect each other, D is also correct.

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Question 8 of 10 What is sin 30º? 60 2 901 D A B. c.. () E. E )

levacccp [35]

Answer:

A. $\displaystyle \frac{1}{2}$

General Formulas and Concepts:

<u>Trigonometry</u>

[Right Triangles Only] SOHCAHTOA
[Right Triangles Only] sinθ = opposite over hypotenuse

Step-by-step explanation:

<u>Step 1: Define</u>

sin 30°

<u>Step 2: Solve</u>

Since sin is opposite over hypotenuse, we need to find the length of the opposite leg of the angle and the length of the hypotenuse.

Given the triangle and it's values, the opposite leg to the 30° angle is 1 and the hypotenuse is 2.

Substituting it into sin, we have:

sin 30° = 1/2 = 0.5

∴ our answer is A.

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