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Parallelogram. a quadrilateral whose opposite sides are parallel. Rectangle. a parallelogram that is equiangular. Rhombus. a parallelogram with four congruent sides. In other words, a parallelogram that is equilateral. Acute Angle. an angle whose measure is less than 90º but greater than 0º.
A polygon is a closed figure whose sides are straight line segments.A regular polygon has sides of equal length and interior angles of equal measure. The perimeter of a polygon is the distance around the polygon, or the sum of the lengths of the sides. A vertex of a polygon is the point where two adjacent sides meet.
Jul 21, 2022 · There’s also a term for two angles whose measurements add up to 90º, they are called complementary angles. One way to remember the difference between the two terms is that “corner” and “complementary” each begin with c (a 90º angle looks like a corner), while straight and “supplementary” each begin with s (a straight angle measures 180º).
1. Segment PT is perpendicular to line RT. 4. Segment PT < segment PR. The measure of a right angle is greater than the measure of an acute angle. Perpendicular lines form right angles. If two angles of a triangle are not equal, then the side opposite the larger angle is longer than the side opposite the smaller angle.
Solution. m∠A + m∠B = 180 ∘. Two supplementary angles make up a straight angle, so the measurements of the two angles will be 180 o. 48 ∘ + m∠B = 180 ∘ m∠B = 180 ∘ − 48 ∘ m∠B = 132 ∘. You know the measurement of one angle. To find the measurement of the second angle, subtract 48 o from 180 o.
A line is sometimes named by a single letter. In the above figure ℓ is the line. Properties of Line: It is a straight path which can be extended indefinitely in both the directions. It is shown by two arrowheads in opposite directions. It does not have any fixed length. It has no endpoints.
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1. The sum of the angles of the triangle is 180°. ∠1 + ∠2 + ∠3 = 180°. 2. If a side of a triangle is produced, then the exterior angle, formed is equal to the sum of the two interior opposite angles. ∠4 = ∠1 + ∠2. Note: An exterior angle of a triangle is greater than either of its interior opposite angles.
