given an angle xOy(xOy<90),the point A is on the Ox ray and the point B is on the Oy ray such that OA=OB, the point C is on the Ax ray anh the point D is on the By raysuch that AC=BD. If AD=7cm then BC=.....cm

true or false

1, there is only one midpoint for any given line segment

2, if AB+BC=AD then B lies between A and D

3, if AB+BC=AC then B is the midpoint of AC

4, If C is the midpoint of AB then AC=BC

5, if B belongs to Ox, A belongs to Oy, Ox and Oy are opposite then O is the midpoint of AB

Let ABC be an isoceles triangle (AB = AC) and its area is 501cm². BD is the internal bisector of the angle ABC (D ∈ AC), E is a point on the opposite ray of CA such that CE = CB. I is a point on BC such that CI = 1/2 BI. The line EI meets AB at K, BD meets KC at H. Find the area of the triangle AHC.

Ghi lời giải dùm mình nha.

Thaks nhiều

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

For Xoy right angle, point A on Ox ray, ray Oy.lay point B on point E on the beam of rays Ox, point F on the beam of rays Oy puzzle that OE = OB, OF = OA.

a, prove that AB = EF and EF square AB

b, Call M, N wrong turn is the midpoint of AB and EF. Prove that triangle square omn weight

Divide $132 into 3 parts such that the second part is 2/3 of the third part and the ratio between the first and the third parts is 3:7. The third part is ....

Các bạn làm giúp mình với, mình đang thi. Cảm ơn các bạn trước.

Divide $285 into three parts such that the second part is 1/4 of the third part and the ratio between the first and the second part is 4:3 The first part is