What is the standard form for 200,00 80,000 700 6?

Pls help! and a reason.

Rasek [7]

Answer:

$\angle BDA = 72^{\circ}$

$\angle DAB = 36^{\circ}$

$\angle BDC = 108^{\circ}$

$\angle BCD = 36^{\circ}$

$\angle DBC = 36^{\circ}$

Step-by-step explanation:

Given

$\angle ABD = 72^{\circ}$

Required

Determine the missing angles

Since AB = AD, then:

$\angle ABD = \angle BDA$ --- Base angles of an isosceles triangle

Hence:

$\angle ABD = \angle BDA = 72^{\circ}$

$\angle ABD + \angle BDA + \angle DAB = 180^{\circ}$ --- angles in a triangle

$72^{\circ} + 72^{\circ} + \angle DAB = 180^{\circ}$

$144^{\circ} + \angle DAB = 180^{\circ}$

Collect Like Terms

$\angle DAB = 180^{\circ} - 144^{\circ}$

$\angle DAB = 36^{\circ}$

$\angle BDA + \angle BDC = 180^{\circ}$ --- angle on a straight line

$72^{\circ} + \angle BDC = 180^{\circ}$

$\angle BDC = 180^{\circ} - 72^{\circ}$

$\angle BDC = 108^{\circ}$

Since ABC is isosceles, then:

$\angle DAB = \angle BCD = 36^{\circ}$ --- base angle of isosceles

$\angle BCD = 36^{\circ}$

Lastly:

$\angle BCD + \angle BDC + \angle DBC = 180^{\circ}$

$36^{\circ} + 108^{\circ} + \angle DBC = 180^{\circ}$

$\angle DBC = 180^{\circ} - 36^{\circ} - 108^{\circ}$

$\angle DBC = 36^{\circ}$

See attachment

3 0

3 years ago

Please i need help on this question?!?!

anzhelika [568]

Answer:

A

Step-by-step explanation:

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6 0

3 years ago

What is 90985 rounded off to the nearest thousand? A.90000 B.91000 C.90900 D.100000

kotykmax [81]

Answer:

B. 91000

Step-by-step explanation:

8 0

3 years ago

PLEASE HELP QUICKLY Evaluate 12 + 4 x 3 - 15

Ivanshal [37]

Answer:

15

Step-by-step explanation:

4×3=12 15-12=3 3+12=15

6 0

3 years ago

When attempting to study for her next Science exam, Alma cannot arrange her notes into the correct order. What has Alma forgotte

Fed [463]

Answer:

c. Include the date on each page of notes

Step-by-step explanation:

The main reason for her not being able to do this is because she did not include the date on each page of notes. Failing to do so means that she does not know which notes she took first and which ones she took later, therefore preventing her from correctly organizing the notes based on when they were taken (in the correct order). Neither the class title or the names of the guest speaker prevent her from organizing her notes in order, thus making the answer c.

6 0

3 years ago