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solniwko [45]
2 years ago
13

Han wrote a proof that triangle BCD is congruent to triangle DAB. Han's proof is incomplete. Which step is missing some informat

ion? DC∥AB
Step 1: Line AB is parallel to line DC and cut by transversal DB. So angles CDB and ABD are alternate interior angles and must be congruent.
Step 2: Side DB is congruent to side BD because they're the same segment.
Step 3: Angle A is congruent to angle C because they're both right angles.
Step 4: By the Angle-Side-Angle Triangle Congruence Theorem, triangle BCD is congruent to triangle DAB .
and WHY?
Mathematics
1 answer:
Ede4ka [16]2 years ago
4 0

Answer:

The answer is below

Step-by-step explanation:

From the image, we can see that DC is parallel to AB.

Step 1:

Alternate interior angles are angles formed at the inner corners of intersection on opposite sides of transversal when two parallel lines are intersected by a transversal.

Since Line AB is parallel to line DC and cut by transversal DB. So angles CDB and ABD are alternate interior angles and must be congruent.

Step 2:

DB ≅ BD (reflexive property of congruence)

Step 3:

∠A = ∠C = 90° (right angles, given). But to prove that both triangles are congruent, the correct step 3 is:

Since, ∠A = ∠C = 90° and angles CDB and ABD are congruent. This means that the third angles in the both triangles are also congruent. Hence, angle ADB and CBD are must be congruent.

Step 4:

BD = DB, angles CDB and ABD  are congruent, angle ADB and CBD are congruent.

Therefore,  By the Angle-Side-Angle Triangle Congruence Theorem, triangle BCD is congruent to triangle DAB .

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Find the surface area of a square pyramid with base edges<br> of 5 cm and a slant height of 3 cm.
ch4aika [34]

Answer:

Surface area of square pyramid = 55cm^{2}

Step-by-step explanation:

Let, b is the base  edges and s is the slant height

According to given condition:

b = 5 cm

s = 3 cm

Find out:

Surface area of square pyramid = ?

Formula:

Surface area of square pyramid = b^{2} + 2bs

Solution:

Surface area of square pyramid = b^{2} + 2bs

Surface area of square pyramid = 5^{2} + 2(5)(3)

Surface area of square pyramid = (25+ 30 ) cm^{2}

Surface area of square pyramid = 55cm^{2}

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3 years ago
Can someone answer it thankyou:-) :-)
NikAS [45]
That's all the answers and the work and i also put the PEMDAS method that i used.

5 0
2 years ago
What is 60% of $49000?
katen-ka-za [31]

Suppose you have a Kohls coupon of $49000 and you want to know how much you will save for an item if the discount is 60 percent.

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Replacing the given values in formula (a) we have:

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In other words, a 60% discount for a item with original price of $49000 is equal to $29400 (Amount Saved).

Note that to find the amount saved, just multiply it by the percentage and divide by 100.

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