GraphicMaths - Angle in a semicircle is 90 degrees
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![](https://graphicmaths.com/img/gcse/geometry/circle-geometry/angle-in-semicircle.png)
The angle at the circumference in a semicircle is a right angle.
![](https://graphicmaths.com/img/gcse/geometry/circle-geometry/cyclic-quad-same-both.png)
GraphicMaths - Opposite angles in a cyclic quadrilateral add up to 180°
![](https://i.ytimg.com/vi/MlblObRfRZk/mqdefault.jpg)
GraphicMaths - Angle in a semicircle is 90 degrees
![](https://graphicmaths.com/img/gcse/geometry/circle-geometry/tangent-proof-triangle.png)
GraphicMaths - Tangent and radius of a circle meet at 90°
![](https://graphicmaths.com/img/gcse/geometry/circle-geometry/angle-in-semicircle-proof2.png)
GraphicMaths - Angle in a semicircle is 90 degrees
![](https://graphicmaths.com/img/gcse/geometry/circle-geometry/tangent-radius.png)
GraphicMaths - Tangent and radius of a circle meet at 90°
![](https://i.ytimg.com/vi/mEYDwmX6IQc/hqdefault.jpg)
Circle Theorems, Angle in a semi-circle = 90 degrees, Euclidean Geometry
![](https://www.geogebra.org/resource/b5VUDWyh/BCHmkuxYpH0b40qo/material-b5VUDWyh.png)
Angles in a semi-circle are 90 degrees – GeoGebra
![](https://www.mathematics-monster.com/testimages/angle_in_semicircle(3)_q2.jpg)
Circle Theorem: Angle in a Semicircle Is 90° (Key Stage 3)
![](https://i.ytimg.com/vi/HY0vmUJ44dA/oar2.jpg?sqp=-oaymwEYCJUDENAFSFqQAgHyq4qpAwcIARUAAIhC&rs=AOn4CLDokP7An3VGnm_G5SXMbxbm8ff_Eg)
Circle Theorem 3 - The Angle in a semi-circle is always 90 degrees #circletheorem #mathinar
![](http://www.timdevereux.co.uk/maths/geompages/geompics/circthe2.gif)
Proof: Angle in a semicircle
Why is there no higher latitude greater than 90 degrees north and
SOLVED: Which option rotates the square 90 degrees? Which
How to draw 90 degree angle using protractor.Construct 90 degree angle using protractor.shsirclasses
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