Proving Area of Parallelogram PQRS with Geometry Proof

In summary, to prove that the sum of two triangles inside a parallelogram is equal to half the area of the parallelogram, you need to use the formula for finding the area of a parallelogram and the formula for finding the area of two triangles inside it. You can also compare the areas of the triangles to show their equality.
  • #1
saikishan
1
0
PQRS is parallelogram and T is any point inside the parallelogram. Prove that delta TSR + delta TQP = 1/2 the area of parallelogram PQRS.

I know this problem has been posted earlier but there was no strong response.

Please someone help me out Grade 12 Geometry Mathematics is tough. :frown:
 
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  • #2
Assuming that delta in your post means area, so to prove that:
[tex]A_{TPQ} + A_{TRS} = \frac{1}{2} A_{PQRS}[/tex], you need the formula to find the area for the parallelogram PQRS, the formala to find the area for the two triangles TPS, and TRS.
After that, you should relate the two formulae above. What do they have in common.
Ok, try the problem again, and see if you get it. :)
 
  • #3
Another way to do it is to compare the area of PQT to the area of PTS, and by extension compare the areas of QTR and RTS. This might require a little less computation--you just have to observe that if you measure the triangles one way (choose the base and height appropriately) they must be equal.
 
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Related to Proving Area of Parallelogram PQRS with Geometry Proof

What is a geometry proof?

A geometry proof is a logical argument that uses deductive reasoning to show the validity of a geometric statement or theorem.

Why is learning how to write a geometry proof important?

Learning how to write a geometry proof is important because it helps develop critical thinking skills and logical reasoning. It also allows for a deeper understanding of geometric concepts and the ability to solve more complex problems.

What are the key elements of a geometry proof?

The key elements of a geometry proof include the given information, the statement to be proven, and a series of logical steps that connect the given information to the statement to be proven. These steps should be supported by definitions, postulates, and previously proven theorems.

How can I improve my ability to write geometry proofs?

To improve your ability to write geometry proofs, it is important to practice regularly and familiarize yourself with the common postulates and theorems. It can also be helpful to break down the proof into smaller steps and clearly label each step with the reasoning behind it.

What are some common mistakes to avoid when writing a geometry proof?

Some common mistakes to avoid when writing a geometry proof include not clearly stating the given information, using incorrect definitions or theorems, and making assumptions without proper justification. It is also important to check for any errors in reasoning and to make sure all steps are clearly connected to each other and the statement to be proven.

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