﻿ Circles: Circumference, Area, Arcs, Chords, Secants, Tangents, Power of the Point. Theorems. All the links are here Unfortunately, in the last year, adblock has now begun disabling almost all images from loading on our site, which has lead to mathwarehouse becoming unusable for adlbock users.

# Circles, arcs, chords, tangents ...

## Interactive & Exploratory Activities

Product Segments Chords Tangents Secants Arcs Angles Central Angle of a Circle Inscribed Angle of a Circle Chord, Tangent and the Circle Angles of intersecting chords theorem Side Length of Tangent & Secant of a Circle ### Circle Calculator

Status: Calculator waiting for input ### Big Circle Q

To solve this probelm, you must remember how to find the meaure of the interior angles of a regular polygon. In the case of a pentagon, the interior angles have a measure of (5-2) •180/5 = 108 °. Therefore, each inscribed angle creates an arc of 216°

Use the inscribed angle formula and the formula for the angle of a tangent and a secant to arrive at the angles

• m BDE = 72 °
• m BFC = 72 °
• m AGD = ½(144 −72) = 36 °