Geometric discussion
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√3a²/4 = √3
a² = 4
a = 2
Veritasium0 wrote:
JomsupVora2020 wrote:
He from US.
🤣
He once told me that.
I just saw @thecosmos000 use India flag on profile and I'm not sure this is him or not.
Ok just a minutes.
Problem 7:
□ABCD has ∠A = ∠C = 90° and AB=7, BC=15, DA=24.
Find the lenght of CD.
Veritasium0 wrote:
20
Correct!
Problem 8:
ΔABC is a triangle. D, E are points on BC, AC respectively such that AB=AD and EC=ED. If ∠ADE=65° and ∠DEC=90° Find the size of ∠BAC.
Problem 9:
Given a triangle whose 3 adjacent angle on the line of interior are 4x, 5x, and 6x.
Find the value of x.
Problem 10:
ΔABC is a triangle. D,G are points on AB such that AD=DG=GB and E,F are points on AC such that AE=EF=FC. if the area of □DEFG is 30 cm².
Find the area of ΔABC.
Veritasium0 wrote:
65°
Correct!
∠ECD=∠EDC=45°
∠ABD=∠ADC=180°-45°-65°=70°
∠BAC =180°-∠ABC-∠ACB=180°-45°-70°= 65°
Sorry, I just fixed some error of the image in problem no 10.
AD:AG = AE:EF = 1:2
∠DAE = ∠GAF (joint angle)
So ΔADE ~ ΔAGF
In the same way we can prove that ΔADE ~ ΔABC
Then the area ratio of two similar triangles is equal to the square of the side length ratio.
Oct 25, 2023
0
#34
What is the probability that the triangle formed by 3 points taken at random on a circle contain the circle's center?
1/4
Or 1/2
3b1b is cool. There’s no way I can prove it lol, but it’s just awesome
He from US.