# maths --plse help me..

posted by .

In a pentagon ABCDE, angle B = 168, angle C:angleD = 23:25 and AB//ED. Find angle C and angle D.

• maths --plse help me.. -

since AB║DE, adding exterior angles at B,C,D = 180

(180-B)+(180-C)+(180-D) = 180
∠B+∠C+∠D = 360
168 + 23x + 25x = 360
48x = 192
x = 4

∠C = 92
∠D = 100

## Similar Questions

1. ### geometry

obtuse triangle ABC with obtuse angle B. Point D on side AC such that angle BDC is also obtuse. Angle DAB is 2/3 of angle ABD. Angle BCD is 1/5 of angle CBD is 4 more than angle BAD. Find the measure of angle ABC.
2. ### maths

In triangle ABC angle B > angle C if AM is the bisector of angle BAC and AN perpendicular BC. prove that angle MAN =1/2(angle B - angle C)
3. ### math

In a triangle ABC,right angled at B, BD is drawn perpendicular to AC. prove that: (i) angle ABD = angle c (ii) angle CBD = angle A
4. ### geometry

In a triangle ABC,right angled at B, BD is drawn perpendicular to AC. prove that: (i) angle ABD = angle c (ii) angle CBD = angle A
5. ### maths

ABCD is a parallelogram the angle bisector of angleA and angleD intersect at O. Find the measure of angle AOD
6. ### maths

The convex pentagon ABCDE has a right angle at B,AB=BC andCD=DE=EA=1cm,AC=2cm.If AC and ED are parallel ,find the area of the pentagon.
7. ### MATHS

ABCD is a cyclic quadrilateral in which angle BAD=70,angle ADC=80 and angle ABD=55,AC and BD intersect at M,find angle CMD
8. ### MATHS

In a triangle ABC, angle B> angle C. If AM is the bisector of angle A and An is perpendicular to BC. Prove that angle MAN=1/2(angle B-angle C).
9. ### Geometry

Two lines intersect so that angle 1 and angle 3 are vertical angles, angle 2 and angle 4 are vertical angles, and angle 1 and angle 2 form a linear pair. how do you slove for x and find the measure of all the angles when angle 2= x …
10. ### Geometry

Problem: ABCDE\$\ is an equilateral pentagon with side length 2 in which angle B= angle E=120 degrees. The area of ABCDE can be expressed in the form square root of x + square root of y for some integers x and y. Find x+y. I don't understand. …

More Similar Questions