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

The worker uses 12 cubic blocks to build a 2-step flight of stair as the figure below. To
prevent it from getting damaged, he covers all the surfaces of the stair with square
hard tiles of side length 15cm, except for the bottom. Find the total area of the hard
tiles needed for this stair in m2

The area of the dining room at thomas jefferson's home in monticello is about 342 square feet. If the approximate length of the one side is a 2-digit prime number, what are the approximate dimensions of the room?

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

Pat has a number of counters to place into the cells of a 3 x 3 grid. She may place any number of counters in each cell or leave some of the cells empty. She then finds the number of counters in each row and each column. Pat is trying to place counters in such a way that these six totals are all different.

What is the smallest total number of counters that Pat can use?

Given 4 points A, B, C, D on a ray such that A lies between B and C; B lies between C and D; OA = 7cm, OD = 3cm, BC = 8cm and AC =3.BD. What is the length of AC

A work is a building a wall of length 6 meters and hight 4 meters. There are 2 windowns on the wall. Both windowns are of the same size 1,5 meters hight and 1 meter wide. Each square meter of the wall needs 17 bricks. How many bricks are need in total?

đây là bài toán tiếng anh nhoa!!

các bn giải bằng tiếng việt giúp mk cũng đc(tiếng anh thì càng tốt)

thanks