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  1. Home
  2. 12th grade
  3. Geometry
  4. Exercise : Use congruence to determine measures

Use congruence to determine measures Geometry

Given that these two triangle are congruent, determine the missing value a.

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The corresponding angles of two congruent triangles are congruent. In the first triangle, the angle opposite the side of length 3 is 30^\circ . So its corresponding angle is also 30^\circ .

\widehat{a}=30°

Given that these two triangle are congruent, determine the missing value a.

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The corresponding sides of two congruent triangles are congruent. Since we have two right triangles, the hypotenuses are corresponding.

Therefore, the length of the legs of both triangles 3 and 4. The Pythagoras theorem applies and we have:

a=\sqrt{3^2+4^2}=5

a=5

Given that these two triangle are congruent, determine the missing value a.

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The corresponding angles of two congruent triangles are congruent. Since the side opposite of \widehat{D} has a length of 17, we can deduce that \widehat{D} is corresponding to \widehat{A}. Therefore, we have:

\widehat{a}=62°

Given that these two triangle are congruent, determine the missing value a.

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The corresponding angles of two congruent triangles are congruent. Thus \widehat{a} is congruent to \widehat{A}. We know that:

\widehat{A} + 65^\circ + 35^\circ = 180^\circ

\widehat{A} = 80^\circ

\widehat{a}=80°

Given that these two triangle are congruent, determine the missing value a.

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The corresponding sides of two congruent triangles are congruent. Here angles \widehat{F} and \widehat{C} are corresponding so the opposite sides of these angles are also congruent. Thus we have:

a = AB =6

a=6

Given that these two triangle are congruent, determine the missing value a.

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The corresponding sides of two congruent triangles are congruent. Here, we can see that \overline{AB} and \overline{DF} are corresponding. Therefore:

a=7

Given that these two triangle are congruent, determine the missing value a.

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The corresponding angles of two congruent triangles are congruent. Thus \widehat{a} is congruent to \widehat{B}. We know that:

\widehat{B} + 25^\circ + 30^\circ = 180^\circ

\widehat{B} = 125^\circ

\widehat{a}=125°

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See also
  • Course : Triangles
  • Exercise : Use the law of cosine to determine lengths and angles
  • Exercise : Find the area of a triangle
  • Exercise : Identify special triangles
  • Exercise : Use properties of special triangles to determine lengths, angles, heights
  • Exercise : Complete proofs involving triangles
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