Question

Q-the second angle of a triangle is twice its first angle. The third angle is 9 times the first angle. Find the angles of the triangle.

Q-8 years ago, Sharmila was 5 times as old as her daughter Rinu. 8 years later,her age will be 4 more than 3 times Rinu's age. How old Rinu now?

PLEASE DO FAST AND CORRECT

Answer 1

Here is the answer of your question

Answer 2

Q1 :-

$angle1 = 15 \: degrees \\ angle2 = 30 \: degrees \\ angle3 = 135 \: degrees$


Q2 :- Present age of Rinu is 26 years.


Please refer the above photograph for the used process.


KEY POINTS TO REMEMBER :-


☸️ The sum of the measures of the interior angles of a triangle is 180


☸️ Properties of Triangle :-


1⃣Sum of the angles of a triangle =180°=180°


2⃣Sum of any two sides of a triangle is greater than the third side.


3⃣The line joining the midpoint of a side of a triangle to the positive vertex is called the median.


4⃣The median of a triangle divides the triangle into two triangles with equal areas.


5⃣Centroid is the point where the three medians of a triangle meet.


6⃣Centroid divides each median into segments with a 2:12:1 ratio


7⃣Area of a triangle formed by joining the midpoints of the sides of a given triangle is one-fourth of the area of the given triangle.


Thanks!