Question

an arch carries the thrust of weight to its _(1)_. with a _(2)_, the horizontal part of the structure supports all the weight above it.
a. (1) center; (2) post-and-bearing
b. (1) base; (2) springing line
c. (1) keystone; (2) groin vault
d. (1) sides; (2) post-and-lintel

please select the best answer from the choices provided

a
b
c
d

Explanation:

To solve this, we analyze each option:

• Option a: An arch's thrust isn't carried to the center, and post - and - bearing isn't the structure with a horizontal part supporting weight as described. Eliminate a.
• Option b: The base is not where an arch carries its thrust (it's the sides), and a springing line is not a structure where the horizontal part supports weight. Eliminate b.
• Option c: A keystone is the top stone, not where thrust is carried, and a groin vault is a type of vault, not matching the description of the second part. Eliminate c.
• Option d: An arch carries thrust to its sides. The post - and - lintel structure has a horizontal lintel (the horizontal part) that supports the weight above it. This matches the description.

Answer:

d. (1) sides; (2) post - and - lintel