18 tài liệu đã gắn thẻ được gắn thẻ "Geometry"

Learn why angles in a triangle always add up to 180°, how to find missing angles, and the types of triangles by their angles. Grade 7–8 geometry with examples.

Learn the area of a circle formula (A = pi r squared) and circumference formula (C = 2 pi r) with clear worked examples and practice problems.

Learn how to calculate the area and perimeter of rectangles, triangles, circles, and more with clear formulas, worked examples, and practice problems.

Learn how to find the area of a triangle using the base-times-height formula. Includes worked examples, Heron's formula, and practice problems.

Learn the difference between complementary angles (sum to 90°) and supplementary angles (sum to 180°). Includes vertical angles, linear pairs, and practice.

Learn the distance formula with clear derivation, 5 worked examples, and practice problems. Find the distance between any two points on a coordinate plane.

Learn the area of a trapezoid formula with clear explanations, step-by-step examples, and practice problems. Master the parallel-bases method.

Learn how to find the perimeter of rectangles, triangles, regular and irregular polygons with clear formulas, worked examples, and practice problems.

Learn about parallel and perpendicular lines, the angle pairs they create with a transversal, and how to identify them using slope. Grade 7-8 geometry guide.

Learn the Pythagorean theorem with clear explanations, a visual proof, worked examples, and practice problems for grades 8-9.

Practice the Pythagorean theorem with 5 worked examples and answers. Find missing sides, verify right triangles, and solve real-world problems step by step.

Solve real-world Pythagorean theorem word problems step by step. Ladders, navigation, construction, and sports — with full worked solutions for grades 8-9.

Learn what Pythagorean triples are, see a list of common triples, and discover how to generate new ones using a simple formula. Worked examples and practice for grades 8-9.

Learn the difference between similar and congruent triangles, the SSS, SAS, ASA, and AA similarity tests, and how to find missing sides using proportions.

Learn how to calculate the surface area of prisms, cylinders, pyramids, cones, and spheres with clear formulas, worked examples, and practice.

Learn the four quadrants of the coordinate plane, how to plot ordered pairs, and how to read graphs. Essential Grade 6–7 geometry and algebra foundation.

Learn the five main types of angles in math: acute, right, obtuse, straight, and reflex. Includes how to measure angles with a protractor and practice problems.

Learn the volume formulas for prisms, cylinders, pyramids, cones, and spheres with worked examples. Step-by-step guide for Grade 8–9 geometry students.