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prohojiy [21]
3 years ago
13

Circle F is congruent to circle J, and ZEFD = ZGJH. m ZDFE = 80'. What is the measure of H?

Mathematics
2 answers:
djyliett [7]3 years ago
6 0

Answer:

50 deg

Step-by-step explanation:

The circles are congruent, so all radii of both circles are congruent.

The given central angles are congruent, so the triangles are congruent by SAS.

Since each triangle has 2 congruent sides (the radii), opposite angles are congruent.

m<DFE = m<J = 80 deg

m<H = m<G = x

m<H + m<G + m<J = 180

x + x + 80 = 180

2x + 80 = 180

2x = 100

x = 50

m<H = 50

Ratling [72]3 years ago
6 0

Answer:

m\angle H=50^{\circ}

Step-by-step explanation:

We are given that circle F is congruent to circle J.

\triangle EFD\cong \triangle GJH

m\angle DFE=80^{\circ}

We have to find the measure of H.

m\angle DFE\cong m\angle GJH

when two triangles are congruent then their corresponding angles and corresponding sides  are congruent.

m\angle DFE=m\angle GJH=80^{\circ}

m\angle JHG=m\angle JGH

JH and JG are radius of circle J. Angles made by two equal sides are equal.

In \triangle GJH

Let m\angle JHG=x=m\angle JGH

m\angle GJH+m\angle JHG+m\angle JGH=180^{\circ}

By triangle angles sum property

Substitute the values then we get

x+x+80=180

2x=180-80=100

x=\frac{100}{2}=50^{\circ}

Therefore, m\angle JHG=m\angle H=50^{\circ}

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