Centrum nauki

Podstawy geometrii: proste ukośne, kąty, figury i pole

Geometria zaczyna się od prostych. Prosta pozioma biegnie w poprzek, prosta pionowa w górę i w dół, a prosta ukośna to każda prosta nachylona — ani pozioma, ani pionowa. Z prostych powstają kąty, figury, obwód i pole, które te lekcje omawiają krok po kroku.

Artykuły: 6

• 1 min czytania

  The Pythagorean theorem

  How a² + b² = c² finds a missing side of any right triangle, plus the triples worth remembering.

• 1 min czytania

  Area of common shapes and circles

  Area formulas for rectangles, triangles, trapeziums and circles — and why the triangle formula has a half in it.

• 2 min czytania

  Area of a trapezium (trapezoid): formula and examples

  The formula for the area of a trapezium (a trapezoid in the US), why it works, and worked examples — including finding a missing height or side.

• 2 min czytania

  Types of triangles: scalene, isosceles and equilateral

  Scalene, isosceles and equilateral triangles — how to tell them apart, their angles, and how to find their area, including the area of an equilateral triangle.

• 1 min czytania

  Polygons and quadrilaterals: is a square a quadrilateral?

  Is a square a quadrilateral? Yes — and a rectangle, a rhombus and a parallelogram. How the family fits together, plus polygon angle sums and areas.

• 1 min czytania

  Triangular prism volume, cylinders, cones and other 3D shapes

  How to find the volume and surface area of a triangular prism, and the volume of cylinders and cones — one idea (area of the cross-section × length) behind most of them.