1. Write the following reversible as a biconditional:
If two perpendicular lines intersect, they form four 90* angles.

A) Two intersecting lines are perpendicular if and only if they form four 90* angles.
B) Two intersecting, perpendicular lines do not form four angles.
C) Four 90* angles are formed by intersecting lines.
D) Perpendicular lines do not intersect.

Is the answer C? I really am confused how to do this since these kind of statements aren't easy for me to understand. Thank you!

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  1. Looks more like A to me.

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  2. No the answer is not C, the answer would be A.

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  3. Biconditional statements use the words "if and only if".

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  4. It is indeed A

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  5. Yep it's A. And uhh the answers are 1C - if it is not raining I will not carry an umbrella 2A - two intersecting lines are perpendicular if and only if they form four 90 degree angles 3A - <DAB and <EAD are supplementary 4C - <FBY and <GBX

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