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 March 10th, 2018, 09:31 AM #1 Banned Camp   Joined: Dec 2017 From: Tel Aviv Posts: 87 Thanks: 3 Rhombus In the picture: http://img2.timg.co.il/forums/47/128...fa71d339c6.png There is a rhombus, A is an angle of the rhombus. A. What will happen if A become a acute angle? B. How I know that A is obtuse angle? C. What will happen if A become a right angle? Thank for solving this.
March 10th, 2018, 10:25 AM   #2
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 Originally Posted by policer In the picture: There is a rhombus, A is an angle of the rhombus. A. What will happen if A become a acute angle? B. How I know that A is obtuse angle? C. What will happen if A become a right angle? Thank for solving this.
a. the opposite angle will also be acute and equal in measure to angle A

b. looks like $90^\circ < \angle{A} < 180^\circ$ in the diagram

c. the rhombus will become a square

 March 10th, 2018, 11:10 AM #3 Global Moderator   Joined: Dec 2006 Posts: 20,383 Thanks: 2011 Let's also consider the same questions for a parallelogram ABCD, with internal angles A, B, C and D. (A). If A becomes an acute angle and ABCD remains a parallelogram, B becomes an obtuse angle. (B). You don't know that B is an obtuse angle. If, however, angle A is greater than angle B, angle A must be obtuse. (C). If A becomes a right angle and ABCD remains a parallelogram, ABCD will have become a rectangle as well, and angles B, C and D will also have become right angles.

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