acute angle
Under ninety degrees
An acute angle is an angle measuring less than 90 degrees—sharper and narrower than a right angle.
The term comes from the Latin for "sharp," contrasting with obtuse angles, which are blunt and wider than 90 degrees.
The roof's steep pitch created acute angles at the peaks.
Angle-measuring instrument
- vertexPoint where edges converge
- degreesUnits of measurement
- triangleThree-sided plane figure
- bisectDivide into two equal portions
isosceles · equilateral · scalene · polygon · complementary · supplementary · adjacent · congruent
Opposite over hypotenuse
- cosineRatio in triangle math
- tangentLine touching curve once
- radiansAngle measurement units
- degreesUnits of measurement
unit circle · opposite · adjacent · hypotenuse · inverse · arc length · sector · quadrant
Angle-measuring instrument
- degreeUnit of measurement
- theodolitePrecision angle-measuring instrument
- sextantMaritime angular measurement device
- clinometerInstrument measuring slope angles
inclinometer · azimuth · elevation · surveying · calibration · precision · gradation · arc minute
protractor
Angle-measuring instrument
bisect · isosceles · equilateral · scalene · polygon · complementary · supplementary · adjacent · congruent · perpendicular
sine
Opposite over hypotenuse
degrees · unit circle · opposite · adjacent · hypotenuse · inverse · arc length · sector · quadrant · periodic
protractor
Angle-measuring instrument
- degreeUnit of measurement
- theodolitePrecision angle-measuring instrument
- sextantMaritime angular measurement device
clinometer · inclinometer · azimuth · elevation · surveying · calibration · precision · gradation · arc minute · bearing
narrow
Of small width
arrowhead · chevron · peak · apex · converging · tight · slim · V-shape · razor · needle
- geometryangles, circles, shapes, lines, volume
- geometry termscircle, line, rectangle, side, square
- Trianglestriangle, equilateral, isosceles, scalene, right triangle
- anglescomplementary angles, supplementary angles, degrees, vertical angles, interior angles
- bladesblade, edge, knife, razor blade, cutting edge
- degreeshigh school diploma, bachelor's degree, GED, master's degree, BS