000 G = 23.000 KG = 23 KGINTERSECTPERIMETER—THE DISTANCE AROUND A F...

23,000 g = 23.000 kg = 23 kgintersectperimeter—the distance around a figureStep 3: Subtract to find the amount over the limit.23 kg −20 kg = 3 kgperpendicular—two lines that intersect to form 90-degree anglesStep 4: Because each stabilizer holds one kilogramquadrilateral—any four-sided closed figureand your supplies exceed the weight limit of theradius—a line from the center of a circle to a pointrack by three kilograms, you must purchase threeon the circle (half of the diameter)stabilizers from the bike store.volume—the space inside a three-dimensional figureStep 5: Each stabilizer costs $2.80, so multiply$2.80 by 3: $2.80 ×3 = $8.40.

3 9 3

A n g l e s

■

An acuteangle is an angle that measures less than90 degrees.An angleis formed by an endpoint, or vertex, and tworays.Acute Angle

ray

■

A rightangle is an angle that measures exactly 90raydegrees. A right angle is represented by a squareat the vertex.Endpoint (or Vertex)Naming AnglesThere are three ways to name an angle.RightB

■

An obtuseangle is an angle that measures moreDthan 90 degrees, but less than 180 degrees.12A CObtuse Angle