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You should learn in it in grade school but you don't really need it unless you have certain jobs like an architect a teacher Shapes are all around us they are important now why do we need triangles to build bridges well because squares and rectangles would bend So don't build bridges on uneven squares

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Q: When is it useful to know about congruent and similar shapes?
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How do you know if shapes are congruent?

When they are identical in sizes and angles


How do you know angles are congruent?

Angles are congruent if they are equal. Corresponding angles in figures that are similar are congruent.


How do you know there is air resistance?

Air resistance is present when an object moves through the air and experiences a force in the opposite direction of its motion. You can observe the effects of air resistance, such as slowing down a falling object or affecting the trajectory of a projectile. Mathematically, air resistance can be accounted for in calculations involving the motion of objects.


What is the term for two figures that have the same shape and size?

Geometric shapes that are identical in size and shape are congruent.


How do you know if two figures are similar or congruent?

congruent figures are the same shape and the same size while similar figures are the same shape but different sizes and it doesn't matter which way the shape is facing


It appears from the name of the HL Theorem that you actually need to know that only two parts of two triangles are congruent in order to prove two triangles congruent Is this the case?

No. You can know all three angles of both and all you can say is that the triangles are similar. Or with any pair of congruent sides you can have an acute angle between them or an obtuse angle.


How do you know if two figures are congruent or not?

They are congruent if they are identical in shape and size.


How do you know if angles are congruent?

If their measures are equal, then the two angles are congruent.


What does CPCTC mean in math terms?

CPCTC is an acronym for the phrase 'corresponding parts of congruent triangles are congruent' It means that once we know that two triangles are congruent, we know that all corresponding sides and angles are congruent.


Are two right triangles congruent why or why not?

Not necessarily. Even if all three angles of one triangle are the same as the corresponding angles of the other, the triangles may be similar but not congruent. And in this case, you don't even know that all three angles are the same.


How do you know if isosceles triangle are congruent?

Tick marks indicate when lines or angles are congruent.


How do you know that two shape are congruent?

When they have the same dimensions and same interior angles they are said to be congruent