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Pythagorean Theorem (with problems)

Pythagoras' Theorem: Given a right triangle with sides a and b and a hypotenuse h (the side opposite the right angle). Then,

Remember that:

A right triangle (right-angled triangle in B ...

Angle Measuremen? Basic

Find angle measures using a protractor and the Angle Addition Postulate.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).

Using the Law of Cosines with SAS (to find the third side? At grade

This lesson covers using the Law of Cosines to find the third side of a triangle.

It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).

Magnetic force on a moving charge (side view)

In this visual a beam of particles is projected into a magnetic field perpendicular to its velocity. You can calculate what the force on a moving charge is like. In this visual the force is seen from ...

Why SSA and AAA Don't Work as Congruence Shortcuts

"Four shortcuts allow students to know two triangles must be congruent: SSS, SAS, ASA, and AAS. Knowing only side-side-angle (SSA) does not work because the unknown side could be located in two differ ...

Triangle Similarity

"There are four triangle congruence shortcuts: SSS, SAS, ASA, and AAS. We have triangle similarity if (1) two pairs of angles are congruent (AA) (2) two pairs of sides are proportional and the includ ...

Hypotenuse Leg

"In right triangles, if two legs are congruent and if the two hypotenuses are congruent, then the triangles are congruent. This is known as the hypotenuse leg theorem. Note that this is the SSA shortc ...

SSS and SAS

"When two triangles are congruent, all three pairs of corresponding sides are congruent and all three pairs of corresponding angles are congruent. If all three pairs of corresponding sides are congru ...

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