If $\frac{AB}{AC} = \frac{BD}{DC}$ then $\angle ABC$ is:
To solve this problem, we need to use the Angle Bisector Theorem. According to this theorem, if a line divides the opposite side of a triangle in the ratio of the other two sides, then it is an angle bisector of the opposite angle.
In the given triangle, we have:
\(\frac{AB}{AC} = \frac{BD}{DC}\)
This means that \(AD\) is the angle bisector of \(\angle BAC\). Therefore, \(\angle BAD = \angle DAC\).
Given \(\angle BAD = 28^\circ\) and \(\angle DAC = 28^\circ\), the total angle at \(A\) is:
\(\angle BAC = \angle BAD + \angle DAC = 28^\circ + 28^\circ = 56^\circ\)
We also know that \(\angle ACD = 60^\circ\).
Since \(\angle ACD\) and \(\angle ABC\) are angles of triangle \(ABC\), we can use the triangle angle sum property:
\(\angle ABC + \angle BAC + \angle ACD = 180^\circ\)
Substituting the known values, we get:
\(\angle ABC + 56^\circ + 60^\circ = 180^\circ\)
Solving for \(\angle ABC\):
\(\angle ABC = 180^\circ - 56^\circ - 60^\circ = 64^\circ\)
Therefore, the correct answer is
$64^\circ$
.
Similar Questions
- In $\triangle ABC$, $BD \perp AC$ at $D$ and $\angle DBC = 40^\circ$. $E$ is a point on $BC$ such that $\angle CAE = 37^\circ$. What is the measure of $\angle AEB$?
- In $\Delta ABC$, $BD \perp AC$ at D and $\angle DBC = 71^\circ$. E is a point on BC such that $\angle CAE = 17^\circ$. What is the measure of $\angle AEB$?
- In triangle ABC, bisector of $\angle\text{ABC}$ and $\angle\text{ACB}$ meet at O. If $\angle\text{BAC} = 60^\circ$, then find the measure of $\angle\text{BOC}$.
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- In $\Delta\text{PQR}$, $\text{QR}$ is extended up to $\text{S}$ so that $\text{RS} = \text{RP}$. If $\angle\text{PRQ} = 70^\circ$ and $\angle\text{QPS} = 110^\circ$ then find the measure of $\angle\text{PQS}$.
- The areas of two similar triangles are respectively $16\text{ m}^{2}$ and $36\text{ m}^{2}$. Find the ratio of their corresponding sides.
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Important Questions from Triangles
What is the circumcenter of the triangle ABC?
What is the centroid of the triangle ABC?
What is the foot of the altitude from the vertex A of the triangle ABC?
In ΔABC, D is a point on BC such that ∠ADB = 2∠DAC, ∠BAC = 70° and ∠B = 56°. What is the measure of ∠ADC?
In ΔABC, ∠A = 66° and ∠B = 50 °. If the bisectors of ∠B and ∠C meet at P, then ∠BPC – ∠PCA = ?
