Is side AB perpendicular to side BC in the right-angled triangle below?
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Is side AB perpendicular to side BC in the right-angled triangle below?
Remember that perpendicular lines are lines that form a 90-degree angle.
We will examine this by drawing the letter T at the intersection point of lines AB and BC as follows:
It seems from the drawing that the angle formed between the lines is a right angle, therefore side AB is indeed perpendicular to side BC.
Yes
What do the four figures below have in common?
Look for a perfect right angle where the lines meet! You can use the 'T-test' - imagine drawing a capital letter T at the intersection. If it looks like a proper T with a 90° angle, the lines are perpendicular.
No! In a right triangle, only the two sides that form the right angle are perpendicular. The hypotenuse (longest side) is not perpendicular to the other two sides.
All perpendicular lines intersect, but not all intersecting lines are perpendicular! Perpendicular lines must form exactly angles. Other intersecting lines form acute or obtuse angles.
Draw a small square symbol at the vertex where the two lines meet. This universally indicates a 90° angle. You can also write '90°' next to it for extra clarity.
Absolutely! Place the protractor's center at the intersection point and measure the angle. If it reads exactly 90°, the lines are perpendicular. This is the most accurate way to verify.
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