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Q: An isoceles triangle has two congruent sides and four points are always coplanar?

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yes

no.

"Congruent" means "same shape and size as the other one". So one thing all by itself is never congruent. It needs something else to be congruent with. An isosceles triangle is never congruent to a scalene triangle, sometimes congruent to any other kind of triangle, and always congruent to another isosceles triangle that's congruent to the first one.

An isosceles triangle.

Isosceles triangle

Related questions

yes

Isoceles triangular * * * * * Any triangle. Congruence is a relationship between two figures. Given any triangle you can always find another that it is congruent to.

It can be but need not always be.

no.

An obtuse triangle does not always have three congruent sides. An obtuse triangle can be any form that always has three angles.

"Congruent" means "same shape and size as the other one". So one thing all by itself is never congruent. It needs something else to be congruent with. An isosceles triangle is never congruent to a scalene triangle, sometimes congruent to any other kind of triangle, and always congruent to another isosceles triangle that's congruent to the first one.

scalene triangle

An isosceles triangle.

Isosceles triangle

Sometimes similar but it depends

No. A triangle with 2-inch sides is not congruent with a triangle with 3-inch sides.

Not all the time but it can happen