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nikdorinn [45]
3 years ago
9

Why can’t I figure out how to be friends with someone on this app lol

Mathematics
2 answers:
Cerrena [4.2K]3 years ago
7 0

Answer:

It's simple ill show yu.

Step-by-step explanation:

First, you tap on the persons avatar name, then you click the plus button to friend them! ;)

blondinia [14]3 years ago
3 0

Answer:

Mhmm

XD

Step-by-step explanation:

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Step-by-step explanation:

They paid 247 dollar

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In ∆ABC, the altitudes from vertex B and C intersect at point M, so that BM = CM. Prove that ∆ABC is isosceles.
Strike441 [17]

Answer:

Given: ∆ABC with the altitudes from vertex B  and C intersect at point M, so that BM = CM.

To prove:∆ABC is isosceles

Proof:-Let the altitudes from vertex B intersects AB at D and from C intersects AC at E( with reference to the figure)

Consider ΔBMC where BM=MC

Then ∠CBM=∠MCB......(1)(Angles opposite to equal sides of a triangle are equal)

Now Consider ΔDMB and ΔCME

∠D=∠E.......(each 90°)

BM=MC...............(given)

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So by ASA congruency criteria

ΔDMB ≅ ΔCME

∴∠DBM=∠MCE........(2)(corresponding parts of a congruent triangle are equal)

Adding (1) and (2),we get

∠DBM+∠CBM=∠MCB+∠MCE

⇒∠DBC=∠BCE

⇒∠B=∠C⇒AB=AC(sides opposite to equal angles of a triangle are equal)⇒∆ABC is an isosceles triangle .

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