Said quadrangle ABCD for the measurement of the angle A; B; C; D proportional voi5; 8; 13va 10.A / Count measure the angles of a quadrilateral ABCDb / Extend sides AB and DC intersect at E, which lasted two sides AD and BC in F. Two-rays catnhau sense of angles AED and corner cutting AFB O. Separate each corner giaccua AFB cutting edge CD and AB at M and N. Prove cuadoan MN O is the midpoint.

Said quadrangle ABCD for the measurement of the angle A; B; C; D proportional voi5; 8; 13va 10.A / Count measure the angles of a quadrilateral ABCDb / Extend sides AB and DC intersect at E, which lasted two sides AD and BC in F. Two-rays catnhau sense of angles AED and corner cutting AFB O. Separate each corner giaccua AFB cutting edge CD and AB at M and N. Prove cuadoan MN O is the midpoint.

Said quadrangle ABCD for the measurement of the angle A; B; C; D proportional voi5; 8; 13va 10.A / Count measure the angles of a quadrilateral ABCDb / Extend sides AB and DC intersect at E, which lasted two sides AD and BC in F. Two-rays catnhau sense of angles AED and corner cutting AFB O. Separate each corner giaccua AFB cutting edge CD and AB at M and N. Prove cuadoan MN O is the midpoint.

Given two adjacent angles AOB and BOC. The sum of measure of them is equal to 160^o and the measure of angle AOB is equal to 7 times the measure of angle BOC

a)Find the measure of each angle

b)Inside angle AOC, draw ray OD such that angle COD=90^o. Prove that OD is the bisector of angle BOA.

c)Draw the opposite ray OC' of ray OC. Find the measure of 2 angles AOC and BOC' then compare them

Given two adjacent angles AOB and BOC. The sum of measure of them is equal to 160^o and the measure of angle AOB is equal to 7 times the measure of angle BOC

a)Find the measure of each angle

b)Inside angle AOC, draw ray OD such that angle COD=90^o. Prove that OD is the bisector of angle BOA.

c)Draw the opposite ray OC' of ray OC. Find the measure of 2 angles AOC and BOC' then compare them

3)Perpendicular lines An angle that has a measure of 90° is a right angle.If two lines intersect at right angles,the lines are perpendicular. d1 and d2 are perpendicular,denote​​d by d1_d2 . A right angle symbol in an angle of intersection indicates that the lines are perpendicular.( mấy bạn giúp mình nha minhf cảm ơn)))

3)Perpendicular lines An angle that has a measure of 90° is a right angle.If two lines intersect at right angles,the lines are perpendicular. d1 and d2 are perpendicular,denote​​d by d1_d2 . A right angle symbol in an angle of intersection indicates that the lines are perpendicular.( mấy bạn giúp mình nha minhf cảm ơn)))

3)Perpendicular lines An angle that has a measure of 90° is a right angle.If two lines intersect at right angles,the lines are perpendicular. d1 and d2 are perpendicular,denote​​d by d1_d2 . A right angle symbol in an angle of intersection indicates that the lines are perpendicular.( mấy bạn dịch giúp mình nha mình cảm ơn)))

trapezoid ABCD with AB // CD , AB < CD , AD = BC = AB , the angle BDC = 30 degrees . calculate the angles A, B ,C ? help me